Fix bug in Julia code for writing hdf5 sequence.
Fix bug in Julia code for writing hdf5 sequence.

In Julia 0.4, need to cast to UInt64 before bit shifting, otherwise you get all
zeros.

BBN-Q/libaps2,BBN-Q/libaps2,BBN-Q/libaps2,BBN-Q/libaps2,BBN-Q/libaps2